Digital pressure transmitter sealing device and digital pressure transmitter based on same

Abstract

The utility model discloses a digital pressure transmitter sealing device and a digital pressure transmitter based on the same, and belongs to the technical field of pressure transmitters. Comprising a cable locking wire connector, a metal corrugated pipe, an adapter and an aviation plug which are connected in sequence, the cable locking wire connector is connected with a shell of the pressure sensor, and the metal corrugated pipe wraps a cable conductor. The digital pressure transmitter is designed based on a conventional cable type digital pressure transmitter and is characterized in that: 1, a metal corrugated pipe with proper specification and size is adopted to protect a cable outgoing line of the pressure transmitter; 2, a cable locking connector in the device can lock a cable lead and fix the metal corrugated pipe and the digital pressure transmitter; and 3, the adapter can realize sealing connection with the metal bellows and the aviation plug at the same time, and the overall sealing performance of the digital pressure transmitter is ensured, so that the device can solve the problems of instability, use risk and operation complexity caused by cable exposure of a cable type pressure transmitter.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure transmitters, and in particular relates to a sealing device for a digital pressure transmitter and a digital pressure transmitter based thereon. Background Art

[0002] Pressure transmitter is the most commonly used sensor in industry. It can convert pressure into pneumatic or electric signals for control and remote transmission, so as to supply secondary instruments such as indicator alarms, recorders, regulators for measurement, indication and process adjustment. It is widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools, pipelines and many other industries.

[0003] The existing pressure transmitters generally have plug-in type and cable type outlet forms. For pressure transmitters with cable outlet form, the cable is generally exposed. This method has the following shortcomings: 1. Flexibility limitation: The flexibility of the cable may be limited by long-term use or harsh environment, resulting in connection performance degradation or damage. 2. Affected by the environment: The cable may not be able to withstand harsh environments (such as high temperature and corrosive environment), resulting in unstable signal transmission. 3. Risk of mechanical damage: The cable is easily damaged by mechanical impact, cutting or extrusion, causing distortion or interruption of the measurement signal. 4. The wiring is not convenient enough and operations such as crimping are required, and the reliability of the wiring needs to be considered. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a digital pressure transmitter sealing device and a digital pressure transmitter based thereon, so as to solve the instability and operational complexity caused by the exposure of the cable of the cable-type pressure transmitter.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The first aspect of the utility model provides a sealing device for a digital pressure transmitter, comprising a cable locking connector, a metal bellows, a adapter and an aviation plug connected in sequence, wherein the cable locking connector is connected to the housing of the pressure sensor, and the metal bellows is coated on the outside of the cable conductor.

[0007] Preferably, the cable locking connector is threadedly connected to the housing.

[0008] Preferably, an O-ring is provided at one end of the cable locking connector connected to the housing.

[0009] Preferably, the cable locking connector is made of metal material.

[0010] Preferably, the adapter is threadedly connected to the aviation plug.

[0011] Preferably, the aviation plug is a five-core aviation plug with pins inside.

[0012] Further preferably, the pin is welded to the cable conductor.

[0013] The second aspect of the utility model provides a digital pressure transmitter, including a housing, a pressure sensor installed inside the housing, the pressure sensor is connected to a cable conductor, and a portion of the cable conductor extending out of the housing is connected to the above-mentioned digital pressure transmitter sealing device.

[0014] Preferably, it also includes a base, and the shell is welded to the base.

[0015] Preferably, the cable conductor is connected to the pressure sensor via wiring.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model provides a sealing device for a digital pressure transmitter, which is designed based on a conventional cable-type digital pressure transmitter. 1. A metal bellows of suitable specifications and sizes is used to protect the outlet cable of the pressure transmitter; 2. The cable lock connector in the device can lock the cable and fix the metal bellows to the digital pressure transmitter; 3. The adapter can simultaneously achieve a sealed connection with the metal bellows and the aviation plug to ensure the overall sealing of the digital pressure transmitter. Therefore, the sealing device of the digital pressure transmitter has the following features: 1. Strong environmental resistance: The metal bellows has good high temperature resistance and corrosion resistance, and is suitable for long-term use in harsh environments. 2. High stability: The metal bellows has a sturdy structure and is not easily damaged by external physical damage, and the signal transmission is stable and reliable. 3. Higher accuracy: When the metal bellows transmits pressure signals, the deformation is more controllable, providing more accurate pressure measurement results. 4. Simple structure: Compared with cable connection, the metal bellows connection is simpler, reducing the possibility of failure and maintenance. 5. Easy installation: Based on its structure, the installation is relatively simpler and does not require too many fixing and protection measures. It can solve the instability, use risks and operation complexity caused by the exposed cable of the cable-type pressure transmitter.

[0018] Furthermore, the cable lock wire connector and the metal bellows are both made of metal materials, which can ensure the reliability of the wiring of the digital pressure transmitter and the feasibility of the connection between the aviation plug and the metal bellows fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the digital pressure transmitter of the utility model.

[0020] Among them: 1-base, 2-pressure sensor, 3-housing, 4-cable locking wire connector, 5-cable conductor, 6-metal bellows, 7-adapter, 8-aviation plug. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] The utility model is further described in detail below with reference to the accompanying drawings:

[0024] The utility model provides a digital pressure transmitter, which comprises a base 1. A pressure interface is provided at the lower end of the base 1. The thread form of the pressure interface can be designed according to different installation requirements to cope with different on-site installation forms.

[0025] The upper end of the base 1 is welded with a shell 3, and a pressure sensor 2 is installed inside the shell 3. The pressure sensor 2 is connected to the pressure interface at the lower end of the base 1, can sense pressure, and convert the pressure into a digital signal through a special circuit for output. A cable conductor 5 is connected inside the shell 3, one end of the cable conductor 5 is connected to the pressure sensor 2 through wiring, and the other end extends out of the shell 3 and is connected to an aviation plug 8 at the end. The part of the cable conductor 5 extending out of the shell 3 is covered with a cable lock connector 4, a metal bellows 6 and an adapter 7 in sequence. The cable lock connector 4 is made of metal material, one end is threadedly connected to the shell 3, and the other end is sealed with the metal bellows 6. An O-ring is provided inside the end of the cable lock connector 4 connected to the shell 3, and a structure for fixing the metal bellows 6 is provided at the end connected to the metal bellows 6, which can lock the cable conductor 5 and seal it, enhance the waterproof performance, and fix the metal bellows 6 at the same time. The metal bellows 6 is made of metal material and is used to protect the cable conductor 5 from external damage. The adapter 7 is used to connect the metal bellows 6 and the aviation plug 8. One end is sealed with the metal bellows 6, and the other end is threadedly connected with the aviation plug 8. The O-ring inside the aviation plug 8 plays a sealing role to ensure that the product is waterproof. At the same time, the metal bellows 6 can be fixed to ensure that the cable conductor 5 is protected by the metal part as a whole and does not leak out.

[0026] The aviation plug 8 is the part where the cable conductor 5 emerges, and is used to be plugged in with other devices to power the transmitter and transmit signals. The aviation plug 8 is preferably a five-core aviation plug with pins inside, and the pins and the cable conductor 5 are welded according to certain electrical definitions. When in use, the aviation plug 8 is plugged in with the other end device to transmit power and signals.

[0027] Example 1

[0028] A digital pressure transmitter includes a base 1, and a pressure interface is provided at the lower end of the base 1. A housing 3 made of 316L material is welded to the upper end of the base 1, and a pressure sensor 2 is installed inside the housing 3. The pressure sensor 2 is threadedly connected to the pressure interface at the lower end of the base 1. A cable conductor 5 is connected to the inside of the housing 3, one end of the cable conductor 5 is connected to the pressure sensor 2 through wiring, and the other end extends out of the housing 3 and is connected to a five-core aviation plug at the end. The outside of the portion of the cable conductor 5 extending out of the housing 3 is sequentially coated with a cable lock wire connector 4, a metal bellows 6 and an adapter 7 made of metal materials. The cable lock wire connector 4 uses an M12×1.5 waterproof locking gland, one end of which is threadedly connected to the housing 3 and sealed by an O-ring, and the other end is sealed and connected to the metal bellows 6. The metal bellows 6 uses a DN10 stainless steel bellows with an inner diameter of about 10 mm and an outer diameter of about 12.7 mm. The adapter 7 uses an M10 lock wire nut, one end of which is sealed and connected to the metal bellows 6, and the other end is threaded and connected to the aviation plug 8. The five-core aviation plug uses an M12×1 five-core aviation plug with a pin inside, and the pin and the cable conductor 5 are soldered with an electric soldering iron.

[0029] The method of using the above-mentioned digital pressure transmitter is to install the base 1 at the thread where the measured medium is located, connect the pressure sensor 2 and the cable conductor 5, and the digital pressure transmitter sealing device composed of the cable lock wire connector 4, the metal bellows 6, the adapter 7 and the aviation plug. The digital pressure transmitter converts the pressure signal into a digital signal through the pressure sensor 2, which is transmitted by the cable conductor 5, and finally connected by the aviation plug 8 with its matching aviation plug. The top of the aviation plug 8 is an end cap with an internal thread. Twist the end cap to tighten it with the socket, transmit the output signal of the transmitter to the receiving device, and parse it into the pressure data of the product. Due to the setting of the sealing device of the digital pressure transmitter, the digital pressure transmitter can better withstand high temperature and corrosive environment, ensure the stable transmission of the signal, and provide more accurate detection results.

[0030] The above content is only for explaining the technical idea of ​​the utility model and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A sealing device for a digital pressure transmitter, characterized in that: It comprises a cable lock connector (4), a metal bellows (6), a conversion piece (7) and an aviation plug (8) which are connected in sequence, wherein the cable lock connector (4) is connected to a housing (3) of a pressure sensor (2), and the metal bellows (6) is coated on the outside of a cable conductor (5).

2. A sealing device for a digital pressure transmitter according to claim 1, characterized in that: The cable lock wire connector (4) is threadedly connected to the housing (3).

3. A sealing device for a digital pressure transmitter according to claim 1, characterized in that: An O-ring is provided at one end of the cable lock wire connector (4) connected to the housing (3).

4. A sealing device for a digital pressure transmitter according to claim 1, characterized in that: The cable locking connector (4) is made of metal material.

5. A sealing device for a digital pressure transmitter according to claim 1, characterized in that: The adapter (7) is threadedly connected to the aviation plug (8).

6. A sealing device for a digital pressure transmitter according to claim 1, characterized in that: The aviation plug (8) is a five-core aviation plug with pins inside.

7. A sealing device for a digital pressure transmitter according to claim 6, characterized in that: The pin is welded to the cable conductor (5).

8. A digital pressure transmitter, characterized in that: The invention comprises a shell (3), a pressure sensor (2) is installed inside the shell (3), the pressure sensor (2) is connected to a cable conductor (5), and the portion of the cable conductor (5) extending out of the shell (3) is connected to the sealing device of the digital pressure transmitter according to any one of claims 1 to 7.

9. A digital pressure transmitter according to claim 8, characterized in that: It also comprises a base (1), on which a shell (3) is welded.

10. A digital pressure transmitter according to claim 8, characterized in that: The cable conductor (5) is connected to the pressure sensor (2) through wiring.

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